On the cracks normal to shape memory alloy/elastic material interfaces
On the cracks normal to shape memory alloy/elastic material interfaces
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DOI：
10.1016/j.engfracmech.2019.106509
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发表时间：
2019-07
影响因子：
5.4
通讯作者：
M. Mirsayar;D. Hartl
中科院分区：
文献类型：
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作者：
M. Mirsayar;D. Hartl
理论和数值分析研究了裂纹垂直传播到完美结合的双材料界面的行为。双材料系统是由一种线弹性材料组成的，在这种材料中，界面裂纹的初始位置与一种形状记忆合金结合。利用基于连续统热力学的形状记忆合金本构模型，探讨了不同材料和操作参数（如最大转变应变、相对马氏体杨氏模量和温度）对裂纹扩展行为和裂纹尖端转变区的影响。提出了一种新颖的封闭解，可以同时得到马氏体转变区的形状和裂纹尖端周围的应变能密度。通过与可比有限元结果的比较，对理论解的有效性进行了检验和讨论。基于临界应力强度因子和临界应变能密度准则分析了裂纹扩展行为。所提出的结果为如何通过调整材料和操作参数来控制包括SMA组件在内的智能复合材料的失效机制提供了初步的理解。
Theoretical and numerical analyses are performed to investigate the behavior of a crack propagating perpendicularly to a perfectly bonded bi-material interface. The bi-material system is composed of a linear elastic material in which the interface crack is initially located bonded to a shape memory alloy. Utilizing a continuum thermodynamics-based constitutive model for the shape memory alloys, the effects of different material and operational parameters, such as maximum transformation strain, relative martensitic Young’s modulus, and temperature, on the crack propagation behavior and the crack tip transformation zone are explored. Novel closed-form solutions are presented to obtain both the shape of the martensitic transformation zone and the strain energy density around the crack tip. The validity of the theoretical solutions is examined and discussed by comparing to comparable finite element results. The crack propagation behavior is analyzed based on both the critical stress intensity factor and the critical strain energy density criteria. The presented results provide a primary understanding of how the failure mechanism can be controlled in smart composites including SMA components by tuning of the material and operational parameters.